What is a hash function?

A hash function is a one-way mathematical algorithm that converts input of any size into a fixed-length string of characters. The same input always produces the same hash, but you cannot reverse-engineer the original input from the hash.

Which hash algorithm should I use?

Use SHA-256 for general purposes — it is secure, fast, and widely supported. MD5 and SHA-1 are broken for security use (collision attacks found). For passwords, use bcrypt, scrypt, or Argon2 instead of raw hash functions.

Is MD5 still safe to use?

MD5 is not safe for security applications since collision attacks were demonstrated in 2004. However, MD5 is still useful for non-security checksums like file integrity verification and cache keys where collision resistance is not critical.

What is a hash collision?

A collision occurs when two different inputs produce the same hash output. For secure hash functions, collisions should be computationally infeasible. MD5 and SHA-1 have known collision vulnerabilities, making them unsafe for cryptographic use.

Gineadóir Hais - MD5, SHA-1, SHA-256, SHA-512

Cad iad feidhmeanna hais cripteagrafacha?

Is algartam matamaiticiúil í feidhm hais chripteagrafach a mhapálann sonraí de mhéid treallach chuig teaghrán de mhéid seasta. Is feidhm aontreo í.

Algartaim a Thacaítear

MD5 (128-giotán): Tapa, ach meastar go bhfuil sé neamhshlán. Úsáidtear le haghaidh seiceálacha sláine sonraí (checksums). Fast but considered insecure for cryptographic purposes. Still used for checksums.
SHA-1 (160-giotán): Algartam atá imithe i léig. Ní mholtar é le haghaidh slándála, ach baintear úsáid as fós i roinnt córas (m.sh. Git). Deprecated for security. Vulnerable to collision attacks since 2017.
SHA-256 (256-giotán): Caighdeán tionscail. Úsáidtear é le haghaidh teastais SSL/TLS agus sínithe digiteacha. Part of SHA-2 family. Widely used in SSL, Bitcoin, and modern security.
SHA-512 (512-giotán): An t-uasmhéid slándála. Moltar é le haghaidh pasfhocail a haiseáil. Strongest common hash. Used in high-security applications.

Ceisteanna Coitianta

An bhfuil MD5 slán fós le húsáid?

Meastar go bhfuil MD5 briste go cripteagrafach. Ná húsáid é ach chun críocha nach mbaineann le slándáil. Le haghaidh slándála, úsáid SHA-256 nó SHA-512.

An féidir hais a aisiompú?

Ní féidir. Is feidhmeanna aontreo iad haiseanna. Mar sin féin, is féidir haiseanna laga a thomhas trí uirlisí mar 'rainbow tables'. Úsáid 'salann' (salt) do phasfhocail i gcónaí.

🔐 Gineadóir Hais (Hash)

Cad iad feidhmeanna hais cripteagrafacha?

Algartaim a Thacaítear

Ceisteanna Coitianta

Key Facts

Frequently Asked Questions

🔐 Gineadóir Hais (Hash)

Cad iad feidhmeanna hais cripteagrafacha?

Algartaim a Thacaítear

Ceisteanna Coitianta

Key Facts

Frequently Asked Questions

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